class Stu:
    def __init__(self):
        self.color='green'
    def func(self):
        pass
        
    @staticmethod
    def static_method():
        print('123')

    @classmethod
    def class_method(cls):
        print('cls:',cls)

Stu.class_method()
Stu.static_method()
#Stu.func()
s1=Stu(
s1.static_method()
s1.class_method()
#print(s1.func())
print(s1.color)